(2.25÷0.375×數(shù)學(xué)公式-0.3×2數(shù)學(xué)公式)÷(2.3×0.25+0.27×2.5)=________.


分析:本題根據(jù)四則混合運(yùn)算的運(yùn)算順序計(jì)算即可.其中第二個(gè)括號(hào)內(nèi)的算式可將式中的2.3×0.25根據(jù)乘法算式的性質(zhì)變?yōu)?.23×2.5后,再據(jù)乘法分配律計(jì)算.
解答:(2.25÷0.375×-0.3×2)÷(2.3×0.25+0.27×2.5)
=(××-×)÷(0.23×2.5+0.27×2.5),
=(1-)÷[(0.23+0.27)×2.5],
=÷[0.5×2.5],
=÷,
=
故答案為:
點(diǎn)評(píng):完成本題要細(xì)心,注意小數(shù)、分?jǐn)?shù)之間的互化及通分約分.
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